.footer{
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    box-shadow: 0 -1px 1px 0 rgb(0,0,0,0.1);
}
.button{
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    outline: none;
}
.button h3{
    font-weight: normal;
    font-size: 12px;
}
.onselect{
    color: red;
}
.notonselect{
    color: slategray;
}